The YBO 3 nanocoatings (shells) were grown onto the cores by the sol–gel method reported in our previous literature. The YVO 4:Eu 3+ nanocrystals (cores) doped with 5 mol% europium were prepared by hydrothermal method. The YVO 4:Eu 3+/YBO 3 core/shell heteronanostructures were prepared by a facile two-step method. YBO 3 has excellent properties such as high VUV transparency, high stability, low synthesis temperature and exceptional optical damage threshold, so the new core/shell heteronanostructures proposed here may have promising applications in the fields of display, lighting and bio-nanotechnology. Compared to the reported heteronanostructures of YVO 4:Eu 3+ such as Y 2O 3:Eu 4:Eu 3+, SiO 4:Eu 3+ and YV 0.7P 0.3O 4:Eu 3+,Bi 2, yttrium borate (YBO 3), is used as shell material in this new heteronanostructures. In this paper, we propose novel YVO 4:Eu 3+/YBO 3 core/shell heteronanostructures that exhibit enhanced photoluminescence efficiency. Many literatures have reported the preparation and luminescence properties of YVO 4:Eu 3+ nanophosphors, but few measures have been taken to improve their luminescence efficiency. Among RE-doped phosphors, europium ions–doped yttrium orthovanadate (YVO 4:Eu 3+) is an important red phosphor, which has been commercially used in CRTs, high-pressure mercury lamps and color television due to its excellent luminescence properties. Luminescence efficiency of RE-doped nanophosphors can be improved by forming core/shell heteronanostructures, because surface defects and surface recombination of the nanophosphors (cores) are greatly reduced by the nanocoatings (shells). More attention should be paid to improve the luminescence efficiency of RE-doped nanophosphors.ĭuring the past decade, core/shell heteronanostructures have been widely investigated to obtain better properties. Consequently, RE-doped nanophosphors have lower luminescence efficiency compared to their corresponding bulk powder phosphors. Unfortunately, high specific surface area and surface defects of the nanophosphors always result in serious surface recombination, which is a pathway for nonradiative relaxation. RE-doped nanophosphors are expected to have high brightness and luminescence quantum yield for practical applications. Furthermore, fluorescent lamps made from small-sized phosphors always have high-packing density and low loading. In recent years, RE-doped nanophosphors have received a great deal of research attention due to the unique applications in higher-resolution displays, drug delivery system and biological fluorescence labeling. Rare-earth (RE)-doped phosphors have a broad range of applications in cathode ray tubes (CRTs), plasma display panels (PDPs), field emission displays (FEDs), X-ray detectors, fluorescent lamps and so on.

Yvo4 yvo4 core shell